FIGURE 4 in Taxonomic revision of the species of Parvanachis Radwin, 1968 (Gastropoda: Columbellidae) from the Gulf of Panama

FIGURE 4. Histological sections from the male reproductive tract of Parvanachis. Scale bar = 200µm. A. Cross section of upper body of P. adamsi showing gonad and seminal vesicle. B. Cross section of upper body of P. nigricans showing the seminal vesicle. C. Cross section through pallial spermiduct loop of P. pygmaea. D. Cross section of mid body of P. nigricans showing the spermiduct loop. E. Semi-longitudinal section of mid-penis of P. pygmaea. F. Semi-longitudinal section through penis of P. pygmaea showing transition from the wide central portion with glandular duct to the filament tip. G. Cross section of body of P. nigricans with a portion of the body wall spermiduct and a partial longitudinal section through the penis showing the basal flap at the upper middle. H. Cross section through the body of P. nigricans with a partial longitudinal section of the penis, showing the transition from the wider glandular portion to the non-secretory filament tip.